This Particular Tid-Bit is from the GiveMeSomeEnglish!!! – Lexis Portal and expanded here for Your English Learning Experience, and for the sake of The Proliferation Of Awesomeness, World-Wide… which is, in fact, The Prime Objective of GiveMeSomeEnglish!!!) 😉
The most common use of this term is in its Noun form, referring to those types of advertisements that appear suddenly on your computer screen, when you don’t have an ad blocker installed on your computer, or the error messages you get when you are not smart enough to finally get rid of Windows and switch to Linux already.
(not a real “Pop-Up”)
In the Noun form, the term should be hyphenated to indicate that it is a “thing” rather than describing an action. This is not a “rule” of English Grammar, but it is in The Common Tongue, because… well… it just makes a hell-of-a-lot-of sense. 😎
In the Phrasal-Verb form, this can be used to refer to:
These can be the ideas that seem to appear in one’s mind or imagination, sans actually having been consciously produced by the person intentionally. The term can also be in reference to a situation occurring with no prior notice, and often coming as a bit of a surprise.
This could be things like…
As a final note, it should be mentioned that the Phrasal-Verb form is not nearly as common as the Phrasal-Noun form. But when used in the Phrasal-Verb form, it is usually used in its separable form. For example…
Have An Excellent Day!